Question

2)The radius of curvature of a concave mirror is 1.5cm.What is its focal length?​

Answer 1

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Radius of Curvature (R) = - 1.5 m(concave mirror)

Object distance (u) = -10 m [Object distance is negative in Concave mirror]

Image distance (v) = ?

f = R/2

Focal length (f) = -1.5/2 = - 0.75 m

Mirror Formula

1/v + 1/u = 1/f

1/v = 1/f - 1/u

1/v = 1/(-0.75) - 1/(-10)

1/v = 1/0.75 + 1/10

1/v= - 100/75 +1/10

1/v = -4/3+ 1/10

1/v= (-4×10+3)/30

1/v= (-40+3)/30

1/v = -37/30

v= -30/37

v = - 0.81 m

Answer 2

Step-by-step explanation:

Focal length (f) of a spherical concave mirror is -1.5cm (using sing covert on)

:.Radio's of curvature =2f

=2×1.5

=3 cm

hope it is helpful for you

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