20. A concave lens of focal length 15 centimeters forms an image 10 ce

1.	20. A concave lens of focal length 15 centimeters forms an image 10 centimeters from thelens. How far is the object placed from the lens? Draw the Ray diagram.
Answer» Answer: FOCAL length (f ) = -15 cm Distance of IMAGE (V) = -10 cm 1v–1u=1f 1/u = -(1/10) – (1/- 15) 1/u =1/15 – 1/10 1/u = -0.033 u = -30 cm so the object is placed 30 cm away from the concave lens.

20. A concave lens of focal length 15 centimeters forms an image 10 centimeters from thelens. How far is the object placed from the lens? Draw the Ray diagram.

Answer»

Answer:

FOCAL length (f ) = -15 cm

Distance of IMAGE (V) = -10 cm

1v–1u=1f

1/u = -(1/10) – (1/- 15)

1/u =1/15 – 1/10

1/u = -0.033

u = -30 cm

so the object is placed 30 cm away from the concave lens.

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20. A concave lens of focal length 15 centimeters forms an image 10 centimeters from thelens. How far is the object placed from the lens? Draw the Ray diagram.​

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20. A concave lens of focal length 15 centimeters forms an image 10 centimeters from thelens. How far is the object placed from the lens? Draw the Ray diagram.