SATHEE: Optics Question 921

Optics Question 921

Question: Radius of curvature of concave mirror is $40 c m$ and the size of image is twice as that of object, then the object distance is

[AFMC 1995]

Options:

A) $60 c m$

B) $20 c m$

C) $40 c m$

D) $30 c m$

Show Answer

Answer:

Correct Answer: D

Solution:

$f = \frac{R}{2} = 20 c m,$

$m = 2$ For real image; $m = - 2,$ .

By using $m = \frac{f}{f - u}$ , $- 2 = \frac{- 20}{- 20 - u} \Rightarrow u = - 30 c m$

For virtual image; $m = + 2$ .

So, $+ 2 = \frac{- 20}{- 20 - u} \Rightarrow u = - 10 c m$

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Optics Question 921

Question: Radius of curvature of concave mirror is 40cm and the size of image is twice as that of object, then the object distance is

Options:

Answer:

Solution:

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Question: Radius of curvature of concave mirror is $40 c m$ and the size of image is twice as that of object, then the object distance is