Answer the following questions. 1. Name four sources of light. 2. Distinguish between transparent and translucent materials. 3. What is rectilinear propagation of light? 4. Give three applications of rectilinear propagation of light. 5. List out the characteristics of the image formed by a pinhole camera. 6. What would happen if the distance between the screen and pinhole is increased? 7. Why don't eclipses happen every month? 8. Draw an illustration showing positions of the Sun, Moon and Earth during a lunar eclipse. 9. When does a solar eclipse occur? 10. Why is it not suggested to watch a solar eclipse with our naked eye? Explain why or why not.
Answers
Answer:
1. Name four sources of light.
An electric bulb.
Candle.
An oil lamp.
A torch.
2. Distinguish between transparent and translucent materials.
When light encounters transparent materials, almost all of it passes directly through them. Glass, for example, is transparent to all visible light. Translucent objects allow some light to travel through them. Materials like frosted glass and some plastics are called translucent.
3. What is rectilinear propagation of light?
The Rectilinear Propagation of Light describes that Light travels in a Straight Line. A mirror changes the direction of Light that falls on it and it travels in a Straight line Path. Reflection of Light occurs when light bounces off a polished surface.
4. Give three applications of rectilinear propagation of light.
The simple applications of rectilinear propagation of light are pinhole camera, the formation of shadows, and elipses.
5. List out the characteristics of the image formed by a pinhole camera.
The image is real, inverted and small in size.
6. What would happen if the distance between the screen and pinhole is increased?
When we increases the distance between the pinhole and the screen in a pinhole of camera, then size, brightness of image changes but image remains inverted.
7. Why don't eclipses happen every month?
They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth. ... Only when the Moon is crossing the plane of the Earth's orbit (the paper) just as it is lining up with the Earth and Sun will an eclipse occur.
9. When does a solar eclipse occur?
A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth.
10. Why is it not suggested to watch a solar eclipse with our naked eye? Explain why or why not.
Exposing your eyes to the sun without proper eye protection during a solar eclipse can cause “eclipse blindness” or retinal burns, also known as solar retinopathy. This exposure to the light can cause damage or even destroy cells in the retina (the back of the eye) that transmit what you see to the brain.
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