Exercises
S K Jain Science Solutions for Exercises
Simple step-by-step solutions to Exercises questions of Light, Shadows and Reflections from Science Based on the Rationalised NCERT Content. Also get 3D topic explainers, cheat sheets, and unlimited doubts solving on EMBIBE.
Questions from Exercises with Hints & Solutions
Write the conditions required for a shadow to form.
What is meant by reflection of light?
Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?
A sheet of plywood, a piece of muslin cloth and that of transparent glass, all the same size and shape, were placed at A one by one in the arrangement shown in the figure. Will the shadow be formed in each case? If yes, how will the shadow on the screen be different in each case? Give reasons for your answer.
Is it possible to see through a sheet that does not permit light to pass through it? How is the material of such a sheet classified?
Why don't you see the image of your face when you stand in front of a clear glass window-pane?
Is air around us always transparent?
Complete the following puzzle with the help of clues given.
ACROSS:
1. The phenomenon due to which the light ray falling on a polished surface changes its direction. (10)
2. Formed due to reflection or refraction of light. (5)
3. The material that does not permit light to pass through it. (6)
4. The dark space between an opaque object and the screen caused due to the cutting off the light falling on the object. (6)
DOWN
5. Light-emitting body. (8)
6. Change in the direction of a ray of light after falling on a smooth polished surface.
