Above picture is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

Convex and Concave

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Concave and Convex

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Both are concave

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Both are convex

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Solution

The correct option is B
Concave and Convex

Region 1 is concave lens and region 2 is convex lens.

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Question 7

You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from

(a) both concave lens and convex lens.

(b) both concave mirror and convex mirror.

(d) Both convex mirror and concave lens.

A spherical mirror and a spherical lens each have a focal length of, -15 cm. The mirror and the lens are likely to be : (a) both concave. (b) both convex. (c) the mirror is concave but the lens is convex. (d) the mirror is convex but the lens is concave.

Question 4

You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an enlarged image of an object you can use either

(a) concave mirror or convex mirror.

(b) concave mirror or convex lens.

(d) concave lens or convex lens.

According to New Cartesian Sign Convention : (a) focal length of concave mirror is positive and that of convex mirror is negative (b) focal length of both concave and convex mirrors is positive (c) focal length of both concave and convex mirrors is negative (d) focal length of concave mirror is negative and that of convex mirror is positive

Q. Question 4
A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be

(a) both concave
(b) both convex
(c) the mirror is concave and the lens is convex
(d) the mirror is convex, but the lens is concave

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Above picture is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

The correct option is B Concave and Convex Region 1 is concave lens and region 2 is convex lens.

The correct option is B
Concave and Convex

Region 1 is concave lens and region 2 is convex lens.