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Image Formation by Lenses

Ram, a scienc...

Question

Ram, a science student, is trying to find the nature of a mirror he found in the lab. For doing that, he has set up an experiment. He kept a candle in front of a mirror and a screen behind the candle. Then, he started moving the screen until he got a clear image of the candle on the screen. Once the image is obtained, he measures and makes a note of the distances between the mirror, candle, and the screen as shown.

Ram can use this mirror as a:

A

Dental mirror used by a dentist

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B

Rearview mirror for a vehicle

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C

Security mirror in a shop

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D

All of the above.

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Solution

The correct option is A Dental mirror used by a dentist
Based on the characteristics of the image formed, it can concluded that the image formed on the screen is real, inverted, and enlarged. The only mirror that can produce an image like this is a concave mirror. A concave mirror can be used by a dentist as a dental mirror to view an enlarged image of the inside of the patient's mouth.

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Q. Ram, a science student, is trying to find the nature of a mirror he found in the lab. For doing that, he set up an experiment. He kept a candle in front of the mirror and a screen behind the candle. Now he started moving the screen until he got a clear image on the screen. Once the image is obtained, he measures and makes a note of the distances between the mirror, candle, and screen as shown.

Ram noticed that the image of the flame of the candle formed on the screen looks bigger. How much bigger in size is the image of the flame?

[0.8 mark]

Q. Ram, a science student, is trying to find the nature of a mirror he found in the lab. For doing that, he set up an experiment. He kept a candle in front of the mirror and a screen behind the candle. Now he started moving the screen until he got a clear image on the screen. Once the image is obtained, he measures and makes a note of the distances between the mirror, candle, and screen as shown.

For finding the focal length, Ram was advised to use the mirror formula. If he is using the mirror formula correctly, what value of focal length will he get?

[0.8 mark]

Q. A student focussed the image of a candle flame on a white screen using a lens. He noted down the position of the candle screen and the lens as mentioned below:
Position of candle = 12.0 cm
Position of lens = 50.0 cm
Position of the screen = 88.0 cm

(iv) Nature of image if he shift the candle between 12 cm and 31 cm?

Q. A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under :

Position of candle

= 12.0 c m

Position of convex lens

= 50.0 c m

Position of the screen

= 88.0 c m

What will be the nature of the image formed if he further shifts the candle towards the lens?

Q. A student focused the image of a candle flame on a white screen using a lens. He noted down the position of the candle screen and the lens as mentioned below:
Position of candle = 12.0 cm
Position of lens = 50.0 cm
Position of the screen = 88.0 cm

(iii) What is the nature of the image? Is it enlarged?

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