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>>Ray Optics and Optical Instruments
>>Combination of Mirror and Lenses
>> $A convex lens has focal length 30 cm. If$

Question

A convex lens has focal length $30$ cm. If an object is placed at a distance of $15$ cm from it then the magnification produced by the lens is?

A

$6.66$

B

$0.5$

C

$1$

D

$2$

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Updated on : 2022-09-05

Solution

Verified by Toppr

Correct option is D)

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f} \Rightarrow \frac{1}{v} - \frac{1}{- 1 5} = \frac{1}{3 0}$
$\Rightarrow v = - 30$
$m = \frac{v}{u} = - \frac{3 0}{1 5}$
$m = - 2 \Rightarrow ∣ m ∣ = 2$ .

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