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A simple microscope is used by watch repairers. Give reason.
A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. The focal length of the lens is:
(a) 50 cm
(b) 40 cm
(c) 60 cm
(d) 30 cm
A coin placed at the bottom of a vessel appears to be raised when water is poured in the vessel.
State whether the image in part (a) is real or virtual?
The erect image formed by a concave mirror is of size double the size of object. How are u and v related?
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
The radius of curvature of a spherical mirror is 18 cm. What is the focal length of this mirror?
The image formed in a plane mirror is always inverted.
The minimum length of the mirror required to see the full image of the person is half ‘ of his height.
