Day 5

1.A lens with a focal length of 20cm is used to form an image of an object placed 30cm infront of it.If the object is moved 10cm closer to the lens,what is the distance between New object and the image?

2.A point object is placed at a distance of 20cm from a converging lens with a focal length of 30cm.A diverging lens with a focal length of 20cm is placed 50cm behind the converging lens.What is the location and magnification of the final image formed by the two lens

3.A glass sphere with a radius of 5cm is immersed in water.if the refractive index of glass is 1.5 and the refractive index of water is 1.33,what is the radius of the virtual image of an object placed 10cm in front of the glass sphere?

4.A converging lens with a focal length of 10cm is placed 20cm infront of a plane mirror.what is the location and magnification of the final image formed by the lens and the mirror?

5.A ray of light is incident on a glass sphere of radius R and refractive index n from the air.The angle of incidence is such that the ray grazes the sphere,and the angle of refraction is 90 degrees.calculate the angle of incidence?