Question

an object of size 7cm is placed infront of A concave mirror of focal lenght 18 cm at what distance from the mirror should a screen be placed so thant sharp focuseed image can be obtained on screen ?find size and nature of image

Answer 1

Answer:

h=7cm

f=–18cm

v=–18cm

From mirror formula

1/f=1/v+1/u

1/–18=1/–18+1/u

u=0

means object should be placed at infinity(∞)

And the image will be point sized , highly diminished , real and inverted and at the principal focus.

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