Reflection of Light

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Reflection of Light - 05

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Q.1. A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of the combinations for the magic mirror from top to bottom *

1 point

Concave, plane and convex

Plane, convex and concave

Convex, concave and plane

Convex, plane and concave

Q.2. In order to determine the focal length of a concave mirror by obtaining the image of a distant object on screen, the position of the screen should be: *

1 point

in any direction with respect to the plane of concave mirror

inclined at an angle 60 to the plane of mirror

perpendicular to the plane of concave mirror

parallel to the plane of concave mirror

Other:

Q.3. The mirror used by a dentist to examine the teeth of a person is : *

1 point

convex

any one of the above

plane

concave

Q.4. An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed 24 cm from the device on the same side as the sun. Select the correct statement about the device. *

1 point

Convex lens of focal length 24 cm

Concave mirror of focal length 24 cm

Convex lens of focal length 12 cm

Convex mirror of focal length 12 cm

Q.5. A student has focussed on the screen a distant building using a convex lens. If he has selected a blue coloured building as object, select from the following options the one which gives the correct characteristics of the image formed on the screen. *

1 point

Real, inverted, diminished and in violet shade

Virtual, inverted, diminished and in blue shade

Real, inverted, diminished and in blue shade

Virtual, erect, diminished and green shade

Q.6. Assertion (A) : A convex mirror is used as a rear view mirror. Reasoning (R) : Convex mirrors have a wider field of view as they are curved outwards. They also give an erect, although diminished image. *

1 point

(A) is false, but (R) is true.

(A) is true, but (R) is false.

Both (A) and (R) are true, but (R) is not the correct explanation of the (A).

Both (A) and (R) are true and (R) is the correct explanation of the (A).

Q.7. Assertion (A) : Light travels faster in glass than in air. Reason (R) : Glass is denser than air. *

1 point

(A) is false, but (R) is true.

Both (A) and (R) are true, but (R) is not the correct explanation of the (A).

(A) is true, but (R) is false.

Both (A) and (R) are true and (R) is the correct explanation of the (A).

Q.8. Assertion (A) : Assertion: A convex lens has a real focus. Reason (R) : All light rays pass through the focus of a convex lens after refraction. *

1 point

Both (A) and (R) are true, but (R) is not the correct explanation of the (A).

Both (A) and (R) are true and (R) is the correct explanation of the (A).

(A) is true, but (R) is false.

(A) is false, but (R) is true.

Q.9. Assertion (A) : Power of a concave lens is negative. Reason (R) : A concave lens has a virtual focus. *

1 point

Both (A) and (R) are true and (R) is the correct explanation of the (A).

(A) is false, but (R) is true.

Both (A) and (R) are true, but (R) is not the correct explanation of the (A).

(A) is true, but (R) is false.

Q.10. A student is performing the experiment of determining the focal length of a given concave mirror by focussing a distant tree on a screen. Which one of the following kinds of images he is likely to obtain on the screen? *

1 point

(A)

(D)

(B)

(C)

Other:

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