An object is placed at a distance 20 cm from a convex lens of focal length 10 cm. Find the image distance and nature of the image.

An object of height 3 cm is placed at 10 cm from a concave lens of focal length 15 cm. Find the size of the image.

While doing an experiment for the determination of focal length of a convex lens, Raja Suddenly dropped the lens. It got broken into two halves along the axis. If he continues his experiment with the same lens,
(a) can he get the image?
(b) Is there any change in the focal length?

The eyes of the nocturnal birds like owl are having a large cornea and a large pupil. How does it help them?

List any five properties of light.

Explain the rules for obtaining images formed by a convex lens with the help of ray diagram.

Differentiate the eye defects: Myopia and Hypermeteropia.

Explain the construction and working of a 'Compound Microscope'.