Question

An object of size (height) 7cm is placed at 25cm in front of a concave mirror of focal length 15cm at what distance from the the mirror should a screen be placed so that we can get a sharp and clear image ? find the nature and height of image
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Answer 1

Answer:

The screen should be placed at a distance of 37.5 cm in front of theconcave mirror.

Explanation:

Size of object  ho=7cm

Size of the object  ho=?

Focal length  f=−15cm

Object distance  u=−25cm

Image distance  v=?

Using mirror formula, f1=v1+u1

−151=v1+−251

v1=75−5+3

v=−37.5cm

Hence, position of image at 37.5cm infront of the mirror.

Magnification(M)=hohi=u−v=−2537.5=−1.5

hi=−1.5×hO

hi=−1.5×7=−10.5cm

Hence,size of image is −10.5cm.

Nature of image is real,inverted and magnified.

Answer 2

Explanation:

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