A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown in the diagram. Select the correct statement about the device (X).

This device is a concave lens of focal length 8 cm.

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This device is a convex mirror of focal length 8 cm.

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This device is a convex lens of focal length 4 cm.

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This device is a convex lens of focal length 8 cm.

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Solution

The correct option is D This device is a convex lens of focal length 8 cm.
The convex lens converges all the rays coming from the distant object at a point on the screen placed at its focus behind the lens.
Thus according to the figure, the device X must be a convex lens of focal length 8 cm.

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Similar questions

Q. A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X).

(a) This device is a concave lens of focal length 8 cm.
(b) This device is a convex mirror of focal length 8 cm.
(c) This device is a convex lens of focal length 4 cm.
(d) This device is a convex lens of focal length 8 cm.

A student focused the image of a distant object using a device 'X' on a while screen 'S' as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device

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(a) Device X is a concave mirror and device Y is a convex lens, whose focal lengths are 20 cm and 25 cm respectively.
(b) Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 10 cm and 25 cm respectively.
(c) Device X is a concave lens and device Y is a convex mirror, whose focal lengths are 20 cm and 25 cm respectively.
(d) Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 20 cm and 25 cm respectively.

Q. A student determines the focal length of a device X, by focussing the image of a far off object on the screen positioned as shown in the figure alongside.

The device X is a :
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(2) Concave lens
(3) Convex mirror
(4) Concave mirror

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A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown in the diagram. Select the correct statement about the device (X).

The correct option is D This device is a convex lens of focal length 8 cm.The convex lens converges all the rays coming from the distant object at a point on the screen placed at its focus behind the lens.Thus according to the figure, the device X must be a convex lens of focal length 8 cm.

The correct option is D This device is a convex lens of focal length 8 cm.
The convex lens converges all the rays coming from the distant object at a point on the screen placed at its focus behind the lens.
Thus according to the figure, the device X must be a convex lens of focal length 8 cm.