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Types of spherical lenses

ntA comcave m...

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ntA comcave mirror of focal length f1 is placed at a distance of d from a convex lens of focal length f2 .A beam of liqht coming from infinity and falling on this convex lens mirror combination returns to infinity .The distance d be?n ntExplain in detail why does one of the two focal length get doubledn

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Q. A concave mirror of focal length

f_{1}

is placed at a distance of d from a convex lens of focal length

f_{2}

. A beam of light coming from infinity and falling on this convex lens concave mirror combination returns to infinity. The distance d must equal

Q. A converging lens of focal length

f_{1}

is placed in front of and coaxially with a convex mirror of focal length

f_{2}

. Their separation is

d

. A parallel beam of light incident on the lens returns as a parallel beam from the arrangement.

Q. A convex lens of focal length

20 c m

is placed coaxially with a concave mirror of focal length

10 c m

at a distance of

50 c m

apart from each other. A beam of light coming parallel to the principal axis is incident on the convex lens. Find the position of the final image formed by this combination.

Q. An object is placed at a distance of

15

cm from a convex lens of focal length

10

cm. On the other side of the lens, a convex mirror is placed such that its distance from the lens equals focal length of the lens. The focal length of the convex mirror is

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