A concave lens of focal length 15 cm forms an image 10 cm from the len

1.	A concave lens of focal length 15 cm forms an image 10 cm from the lens . How far is the object placed from the lens? Draw the ray diagram.
Answer» ANSWER: Given, focal length, f = -15 cm Distance of image, v = -10 cm Distance of OBJECT, u =? We know that, 1/v - 1/u = 1/f So, 1/-10 - 1/u = 1/-15 So, -1/10 + 1/15 = 1/u (-3 + 2)/30 = 1/u -1/30 = 1/u Therefore u = -30 cm Thus object is placed 30 cm AWAY from the concave lens. Negative sign shows that object is at 30cm in front of the lens. Explanation: Rate it 5 star. I had to make the diagram on my PC it took half an hour... Ask more questions related to physics your brother will there to HELP you. Jai Hind

A concave lens of focal length 15 cm forms an image 10 cm from the lens . How far is the object placed from the lens? Draw the ray diagram.

Answer»

ANSWER:

Given,

focal length, f = -15 cm

Distance of image, v = -10 cm

Distance of OBJECT, u =?

We know that,

1/v - 1/u = 1/f

So,

1/-10 - 1/u = 1/-15

So, -1/10 + 1/15 = 1/u

(-3 + 2)/30 = 1/u

-1/30 = 1/u

Therefore u = -30 cm

Thus object is placed 30 cm AWAY from the concave lens.

Negative sign shows that object is at 30cm in front of the lens.

Explanation:

Rate it 5 star. I had to make the diagram on my PC it took half an hour... Ask more questions related to physics your brother will there to HELP you. Jai Hind

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