. An object of height 1.5 cm is placed at a distance of 20 cm from a c

1.	. An object of height 1.5 cm is placed at a distance of 20 cm from a concave mirror of focal length 15 cm. At whatdistance from the mirror should a screen be placed so as to get a sharp image. Where should the screen bemoved if the object is moved towards the focus?
Answer» ANSWER: h=2cm u=-30CM(sign convention) f=-15(sign convention) v=? 1/f=1/v+1/u 1/-15=1/v+1/-30 1/-15-1/-30=1/v 2-1/-30=1/v 1/-30=1/v v=-30cm the screen should be placed 30cm in FRONT of the mirror to obtain a SHARP IMAGE

. An object of height 1.5 cm is placed at a distance of 20 cm from a concave mirror of focal length 15 cm. At whatdistance from the mirror should a screen be placed so as to get a sharp image. Where should the screen bemoved if the object is moved towards the focus?

Answer»

ANSWER:

h=2cm

u=-30CM(sign convention)

f=-15(sign convention)

v=?

1/f=1/v+1/u

1/-15=1/v+1/-30

1/-15-1/-30=1/v

2-1/-30=1/v

1/-30=1/v

v=-30cm

the screen should be placed 30cm in FRONT of the mirror to obtain a SHARP IMAGE

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. An object of height 1.5 cm is placed at a distance of 20 cm from a concave mirror of focal length 15 cm. At whatdistance from the mirror should a screen be placed so as to get a sharp image. Where should the screen bemoved if the object is moved towards the focus?

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