Which of these has virtual focus?

Concave lens

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Convex lens

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Convex mirror

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Concave mirror

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Solution

The correct options are
A
Concave lens

C
Convex mirror

As for the concave lens the rays seem to be coming from a point behind the lens, that point is the virtual focus. Also, for convex mirrors the rays seem to be originating from the unpolished side of the mirror, so they also have virtual focus.

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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

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(b) both concave mirror and convex mirror.

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Which of the following can make a parallel beam (a) concave mirror as well as concave lens (b) convex mirror as well as convex lens (c) concave mirror as well as convex lens (d) convex mirror as well as concave lens

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

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(d) concave lens or convex lens.

Q. Question 19
In which of the following, the image of an object placed at infinity will be highly diminished and point sized?

(a) Concave mirror only
(b) Convex mirror only
(c) Convex lens only
(d) Concave mirror, convex mirror, concave lens and convex lens

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Which of these has virtual focus?

The correct options are A Concave lens C Convex mirror As for the concave lens the rays seem to be coming from a point behind the lens, that point is the virtual focus. Also, for convex mirrors the rays seem to be originating from the unpolished side of the mirror, so they also have virtual focus.