Question

An object is placed 20cm from the concave lens. focal length of the lens is 30cm. Then find the image distance.

Answer 1

Answer:

These types of problems can all be solved using the lens (or mirror) equation.

1/20 +1/q= 1/10

q=30 cm

The image is formed behind the lens at 2f or the center of curvature.

It is real, inverted, and the same size as the object

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Answer 2

Given

• An object isis placed at 20 cm in concave Len's
• u=-20
• Focal length is -30

To find

• Distance of imageV=?

Solution

From mirror formula

$\boxed{\boxed{\sf\red{\frac{1}{F}=\frac{1}{V}-\frac{1}{u}}}}$

Putting the values

1/-30=1/v-(-1/20)

1/30=1/v+(1/20)

1/v=-1/30-1/20

1/v =-5/60

v= -12

Additional information the image is small