Physics
Fill in the blanks.
(a) Light propagates in …………… motion.
(b) Sun is a …………… source of light.
(c) …………… objects cast a shadow.
(d) A collection of rays coming from different directions which meet at a single point is called …………… beam.
(e) Blocking of the light of the sun by a heavenly body is called …………… .
Light Energy
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Answer
(a) Light propagates in rectilinear motion.
(b) Sun is a natural source of light.
(c) Opaque objects cast a shadow.
(d) A collection of rays coming from different directions which meet at a single point is called convergent beam.
(e) Blocking of the light of the sun by a heavenly body is called eclipse.
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Related Questions
Do any other planets of the solar system also experience eclipse?
Some of the facts that you have learnt till now are listed below. Tick (✓) the facts that are correct and cross (x) the facts that are incorrect.
(a) Light can propagate in any type of motion.
(b) Translucent objects cast a faint shadow.
(c) The colour of the shadow depends on the object.
(d) The size of the shadow is independent of the size of source of light.
(e) Eclipse occurs when a heavenly body blocks the sunlight.
State whether the following statements are true or false. Correct the false statements.
(a) Non-luminous objects like trees and chairs emit light of their own.
(b) A transparent material allows all the light to pass through.
(c) Translucent objects cast a dark shadow.
(d) The shape of shadow is independent of the object blocking light.
(e) A pinhole camera forms an inverted image.
What is the darker region of the shadow called?
- Umbra
- Penumbra
- Screen
- Dark shadow