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Standard XII

Physics

Combinations of Lenses & Mirrors

μ=3/2Figure s...

Question

$μ = \frac{3}{2}$

Figure shows on object O at a distance of 40 cm from lens, a glass slab at 20 cm from lens. A concave mirror is to be placed such that final image after reflection is formed at object itself. What is/are separation of object from mirror?

100 cm or 40 cm

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60 cm or 40 cm

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102 cm or 82 cm

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208 cm or 86 cm

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Solution

The correct option is C 102 cm or 82 cm

Due to presence of slab, the image of lens shifts towards right by $t [1 - \frac{1}{μ}] = 2 c m$
Thus required distance is 102 cm or 82 cm

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Similar questions

μ = \frac{3}{2}

Figure shows on object O at a distance of 40 cm from lens, a glass slab at 20 cm from lens. A concave mirror is to be placed such that final image after reflection is formed at object itself. What is/are separation of object from mirror?

Q. A point object

O

is placed at a distance of

20 c m

from a convex lens of focal length

10 c m

as shown in fig. At what distance

x

from the lens should a concave mirror of focal length

60 c m

, be placed so that the final image coincides with the object?

Q. A glass slab

(μ = \frac{3}{2})

is placed infront of a concave mirror as shown in the figure. At what distance

x

should an object be placed to the left of the slab, such that the final image forms on object itself.

Focal length of convex lens is 20 cm, focal length of concave mirror is 30 cm. And the separation between lens and mirror is 90 cm. If the object is placed 60 cm before lens, find out position of image formed by concave mirror?

Q. A plano convex glass lens

(μ_{g} = \frac{3}{2})

of radius of curvature

R = 10 cm

is placed at a distance of

b

from a concave lens of focal length

20 cm

. What should be the distance

a

of a point object

O

from the plano convex lens, such that the position of final image is always at same distance from concave lens?

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μ=32 Figure shows on object O at a distance of 40 cm from lens, a glass slab at 20 cm from lens. A concave mirror is to be placed such that final image after reflection is formed at object itself. What is/are separation of object from mirror?

The correct option is C 102 cm or 82 cm Due to presence of slab, the image of lens shifts towards right by t[1−1μ]=2cm Thus required distance is 102 cm or 82 cm

$μ = \frac{3}{2}$

Figure shows on object O at a distance of 40 cm from lens, a glass slab at 20 cm from lens. A concave mirror is to be placed such that final image after reflection is formed at object itself. What is/are separation of object from mirror?

The correct option is C 102 cm or 82 cm

Due to presence of slab, the image of lens shifts towards right by $t [1 - \frac{1}{μ}] = 2 c m$
Thus required distance is 102 cm or 82 cm