Refraction & Lenses

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Try the first 5 questions

1.
The power of a concave lens of focal length 50 cm is:
2.
A convex lens of focal length 20 cm and a concave lens of focal length 40 cm are placed in contact. The focal length of the combination is:
3.
An equiconvex lens (n = 1.5) has radius of curvature 20 cm. Its focal length is:
4.
The minimum distance between a real object and its real image formed by a convex lens of focal length f is:
5.
A convex lens of focal length 10 cm forms a real image 30 cm from the lens. The object distance is:

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