Exercises II — task. Science CBSE, Class 10.

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Choose the correct answer:

1. Where should an object be placed in front of a convex lens to get a real image of the size of the object?

Between the optical centre of the lens and its principal focus
At twice the focal length
At the principal focus of the lens
At infinity

2. A spherical mirror and a thin spherical lens have a focal length of -15 cm. The mirror and the lens are likely to be

both convex
the mirror is convex, but the lens is concave
both concave
the mirror is concave and the lens is convex

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