1. Which of the following statement is true?
2. If the focal length is negative then the lens is
3. The formula for formation of image in case of a curved surface is
4. Focal length of the Plano - Convex lens is __________ when its radius of curvature of the surface is R and n is the refractive index of the lens.
5. The formula for formation of image in the case of plane mirror is ____
6. For drawing a ray diagrams we represent convex lens with a symbol ____
7. The value of the focal length of the lens is equal to the value of the image distance when the rays are
8. On what factors does the focal length of a lens depends?
9. The distance between focus and optic centre is
10. The lens which can form real and virtual image is
12. The ray that travels along the principal axis is
13. If the focal length is positive then the lens is
14. The line that joins the centre of curvature and the pole is called
15. Lens formula is _____
16. The focal length of a lens has ______ in water
17. The distance between the focal point and optic centre is called the
18. The rays passes away from the principle axis is
19. Which of the following is the lens maker's formula
20. Which of the following materials cannot be used to make a lens?
