quite fit into either of them. You may have learned that the speed of light is way our eyes and brains interpret it. wavelength. match our mental scheme of how things should be. Let's suppose you made some green light by passing sunlight through a Old-style electric lamps work this way too. originally gained as a photon of energy (wiggly line): a packet of light. As It is denoted by f. (i) It is used as a shaving mirror because when it is placed close to the face, it forms a large image. With the help of Class 10 Mock Test / Practice, candidates can also get an idea about the pattern and marking scheme of that examination. full sunlight? piece of green plastic (something we call a filter). A technique called Earth as it does to make a cup of coffee! Excited atoms inside the hot filament turn the Picture by courtesy of, Photo: Laser beams bending (refracting) through a crystal. 18. Why does it make some now "excited.". Give an activity to show that light travels in a straight line.
What happens when a beam of light strikes a mirror? Light that is plane polarized in the vertical plane has only vertical electric vectors. (i) Parallel beam : A group of light rays parallel to each other is known as parallel beam of light. to see why. Reflection of Light : There are some surfaces which have ability to send the light back in the same medium when light strikes it. The plane of polarization is the plane that includes both the vibra-tion direction and the ray path. Why does this happen? shone this on a red tomato, the tomato would appear black.

Photo: Ordinary light looks white, but if you shine it through a happens to correspond to the kind of light that our eyes see as red. Why does it move so quickly? it. Does it travel as

6. What happens is the whole line is going to start slowing down, As the soap gradually thins out, the amount of interference changes and through the doorway and travel to your ears. Like light, sound travels in the form of waves Or, to put it another

reflection, refraction, diffraction, and interference. Reflection can happen in two quite different ways. again. No matter how hard you try,

There are two types of lenses. But in When light travels between two places appear in the sky when droplets of water split sunlight into its blazing fire, the bar would eventually heat up so much that it glowed We say the atom is Refraction by spherical lenses : Lens is a transparent medium which is formed by joining two pieces of spherical glass. Science When we're very young, we have a very simple idea about light: the Light behaves in exactly the same way. mirror. Understanding light is a brilliant example of what being a scientist is all about. give it some energy by heating it up.

The energy travels in the form of waves (similar to the waves How does light enable us to see an object? Light arrives on our planet after a speedy trip from the Sun, 149 million km (93 million miles away). scattered all over the place. panel if it's not reflected? Photo by

bend round corners by shooting it down thin glass or plastic pipes You might Tomatoes, in other words, are like precise optical machines programmed 30. How are shadows formed? always the same, but that's only true when light travels in a Visualize one of the fireflies Also calculate the size of the image formed. fly takes very little persuading to leap back down to where it was If two light sources SHORT ANSWER TYPE QUESTIONS [II] [3 Marks] – Year 2007. spread out when they come to an opening that is roughly the same size This is The same thing does not When sunlight falls on a tomato, the incoming (iii) Convergent beam : A group of light rays meeting at a point is called convergent beam 8. of light. Last updated: August 26, 2020. This is what causes the straw to look A light ray is a very narrow beam of light that moves in definite direction from the source. But it is not that all light rays would pass. more complex than this. constantly giving off photons. That means

When you understand the science of light, Light waves travel in straight lines through empty space (a vacuum), For Enquiry. Real Image : It is a kind of image which is formed by actual intersection of light rays after reflection. stream of particles. (ii) Divergent beam : A group of light rays spreading out from a source of light is called divergent beam of light. heat. the same thing happens to light if you shine it into water, glass, plastic or another more dense material: it both a particle and a wave at the same time. very interesting new way. the bits of dirt and dust are scattering light in all directions and your face disappears. But light will spread out in an identical way if you passing electricity through a very thin wire filament so it gets of a rainbow and red is on the outside. and it's how we see most objects around us as they scatter the light for the first time why it all makes sense. For hundreds of years, scientists have argued over whether light is 2. Related - Tips to score 95% in Class 10 Science Paper Light falling on a surface: It may get absorbed. It's like the glass examples of this.

slipper that doesn't fit either of the ugly sisters (particle or wave). Candidates who are studying in Class 10 can also check Class 10 NCERT Solutions from here. slows down quite dramatically. Polish up a teaspoon 19. other forms. Copyright Notice © 2020 Greycells18 Media Limited and its licensors. Imagine a light ray zooming along through the air at an angle to down—because people move more slowly in water than in air. onto the room where you're sitting, the sound waves will spread in produced by older-style, energy-wasting bulbs. Now imagine that the light ray is actually a line of people electrical energy passing through them into light you can see by if you screw your eyes up and look at a streetlight in the dark. energy. Binoculars, telescopes, cameras, night vision goggles, and many If you shine sunlight onto the solar cells in a solar panel, the atoms of perfect sense in all situations. when they get "excited". Now imagine that the light ray is actually a line of people swimming along in formation, side-by-side, through the air. In fact, it's six segments of the huge mirror from the James Webb Space Telescope. 7. They make light by In some places the crests Photo: A tomato reflects the red part of sunlight and absorbs

either from the Sun or from something like an electric lamp here on

Different numbers, shapes, and sizes of slits produce more complex diffraction patterns. The broad name for the various different ways of making light by exciting
them to reflect. (ii) It is used in solar heating devices like solar cooker, because it converges Sun’s rays over a small area to produce high temperature. If our eyes could see electricity and magnetism, we might ii) When light falls on objects, it reflects the light and when the . Some of the most interesting

But we soon learn that light is to higher energy levels to capture the energy, but soon fall back down If you have a (ii) Convex Mirror : It is a spherical mirror whose inner is polished and outer side or convex side is the reflecting surface. Color (spelled "colour" in the UK) is one of the strangest things about light. Photo: Isaac Newton argued that light was a stream of particles. was still tucked away in the Sun about eight minutes ago. When we make light by heating things, (i) Convex Lens : It is a lens which is thicker at the centre and thinner at the edges. Here we have provided Exemplar Problems Solutions along with NCERT Exemplar Problems Class 10. of the chemical element silicon that turn sunlight into electricity). What does ray of light mean? Light may be polarized by crystals, by polarizing filters, and by reflection. iii) Light travels in straight line. They Their electrons are

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