Light class 10 numerical.

1. 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Give the location of image and magnification. Describe what happens to the image as the needle is moved farther from the mirror.

2. Ashish placed a pencil perpendicular to principal axis in front of a converging mirror of focal length 30 cm. The image formed is twice the size of the pencil. Calculate the distance of the object from the mirror.

3. if Abhishek  placed a object at a distance of 25 cm away from a converging mirror of focal length 20 cm. Discus the effect on the nature and position of the image if the position of the object changes from 25 cm to 15 cm. Justify your answer without using mirror formula.

4. A 10 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 30 cm. The distance of the object from the lens is 20 cm. Find the:
(a) Position
(b) Nature
(c) Size of the image formed

5. A 6 cm object is placed perpendicular to the principal axis of a convex lens of focal length 15 cm. The distance of the object from the lens is 10 cm. Find the position, size and nature of the mage formed, using the lens formula.

6. if power of lens is 5D find the focal length of lens?

7. if the focal length of convex mirror is 80 cm find power of the lens?

8. The refractive index of Ruby is 1.71. What is meant by this statement?

9. if the refractive index of a glass is 1.2 find the speed of light in glass if the speed of light in vacuum is 300000 km/s. 

10. if  angle of incidence  is 45 degree and angle of refraction is 30 degree find refractive index .   

IF YOU HAVE ANY PROBLEM YOU CAN ASK IS COMMENT SECTION