1. Write the difference between convex and concave lens.
2. Convex lens and concave lens are called converging and diverging lens respectively, why?
3. What do you mean by "the power of lens is 1 dioptre?
4. Define magnification of lens.
5. Define focus and focal length.
6. Define power of lens and it's unit.
7. If a burning candle is placed at a distance of 4 cm from a convex lens having a focal length of 2 cm, draw a ray diagram to show the information of the image.
8.practise all ray diagram.
9. In which condition does a convex lens give erect image? Draw a ray diagram.
10. What is focusing of lens?
11. Define defect of vision.
12. Differentiate between myopia and hypermetropia.
13. Give two example of optical instrument.
14. Define near point of an eye.
15. Draw a diagram of eye suffering from myopia and it's corrected image. Also mention the causes and remedies of it.
16. Draw a diagram of eye suffering from hypermetropia and it's corrected image. Also mention the causes and remedies.
17. A man uses lens of +1.5D. Draw a diagram to show defect of his eyes.
18. Difference between eye lens and lens of camera.
19. Define far point. What is it's value for a normal eyes? Write function of ciliary muscle and iris.
20. If the focal length of the lens of the spectacles needed for this eye is 50cm, what will be it's power?
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