Question

Focal length of the concave mirror is 30 cm. Object distance is 60 cm, Then the image distance is

A) + 60 cm

B) -30 cm

C)-40 cm

D) -60 cm​

Answer 1

Answer:

refer the above attachment..

D) -60 cm is an correct answer..

Answer 2

Answer:

Concept :

Everyone is accustomed to seeing themselves in mirrors. In fact, it's likely that you've already viewed numerous mirrors today! The majority of the mirrors you use every day are flat mirrors, which reflect an image that appears to be the exact same size as the object in front of the mirror. If you look in a flat mirror, you will see that you are precisely the same size as you are in real life and that you are standing in front of the mirror while you are actually behind it.

Given :

The concave mirror's focal length is 30 cm. When an object is 60 cm away, the image distance is

A) + 60 cm

B) -30 cm

C)-40 cm

D) -60 cm

Find :

To find the image distance

Answer:

Given

$f = - 30\\u = -60$

to find v ;

The equation applies to the concave mirror is

$\frac{1}{f} =\frac{1}{v} +\frac{1}{u}$

$\frac{1}{-30} =\frac{1}{v} -\frac{1}{60}$

$\frac{1}{-30} +\frac{1}{60} -\frac{1}{v}$

then,

$-2+\frac{1}{60} =\frac{1}{v}$

$\frac{-1}{60} =\frac{1}{v}$

therefore ,  

$v = -60$

the image distance is $+60 cm$

Spherical mirrors come in two different shapes: concave and convex. We'll talk about a concave mirror's focal length in this article. Although both types of mirrors' focal lengths have the same definition and measurement units, the indicators of focal length for these two mirrors differ. All of these crucial points are presented here. Once more, an experiment is conducted to establish the focal length of a concave mirror.

∴ the answer is option(A) +60 cm

#SPJ3