Question

an object 4 cm tall is placed in front of a concave mirror of focal length 20cm at a distance of 30 cm from it find the position nature and size of the image​

Answer 1

Answer:

image is formed at the distance of 60. from the pole of the mirror

nature==== real ,inverted and larger than the object

Answer 2

Answer:

-8cm

Explanation:

h=4cm,u=-30cm,f=-20cm,v=?,h'=? 1/f=1/u+1/v. 1/-20=1/-30+1/v. 1/v=1/-20+1/30=-1/60 v=-60cm , image is real. m=h'/h=-v/u. h'=-v/u×h=-8cm

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