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A concave mirror has a focal length of 15 cm. If an object is placed 20 cm away from the mirror, find the position and nature of the image formed ????
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Asked by rv5238428 | 15 Jun, 2024, 19:43: PM
answered-by-expert Expert Answer

we have mirror equation as

(1/v) + (1/u) = 1/f

where v is mirror-to-image distance , u is mirror-to-object distance and f is focal length .

u = -20 cm

f = -15 cm

1/v = 1/f - 1/u = (-1/15) +(1/20) = -1/60 cm-1 .

v = - 60 cm

image is formed at a distance 60 cm in front of mirror .

magnification = -v/u = - (-60)/(-20) = - 3 cm

image is real, magnified by 3 times  and inverted .

Answered by Thiyagarajan K | 15 Jun, 2024, 20:44: PM

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