Question

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Answer 1

Explanation:

as the lens is concave , focal length will be negative, object distance by convention is negative

Answer 2

Answer:

Explanation:

u=-60 cm

f=-30 cm

we know that lens formula states that

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

-1/30=1/v-(-1/60)

=-1/30=1/v+1/60

-1/30-1/60=1/v

-2-1/60

-3/60=1/v

v=60/-3

v=-20 cm

distance of image is -20 cm

(ii) size=magnification

we know that

m=v/u

m=-20/-60

m=1/3

m=0.33

magnification is 0.33

(iii) f=-30cm=-0.3 m

p=?

we know that

p=1/f

p=1/-0.3

p=-3.3 D