Physics, asked by agarwalkushang, 1 year ago

An object of length 4cm is placed in front of a concave mirror at distance 30 cm . The focal length of the mirror is 15 cm . (A) where will the image form . (B) what will be the length of the image....plz explain every step .

Answers

Answered by ritika87
56
This the answer of this question
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agarwalkushang: But the height is coming in negative is that not a problem
agarwalkushang: -4
agarwalkushang: it must be 4
ritika87: yes it is 4 but negative sign indicate that it is in downward direction
agarwalkushang: ohh kk thanks
Answered by mayapalhade677
5

Answer:

The relationship between the radius of curvature and focal length is that the radius of curvature is twice the focal length.

In this case, focal length of the concave mirror is given as 15 cm. Hence, the radius of curvature is 15×2=30cm.

A point in front of a concave mirror, on its principal axis, such that parallel rays travelling parallel to the principal axis, after reflection actually converge at this point. When the image forms on the object, then the object as well as the image are situated at centre of curvature of concave mirror.

The distance between the object and mirror is given as 30 cm.

Hence, the image will also form at a distance of 30 cm in front of the mirror as the radius of curvature and the object distance are the same

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