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A 3 cm tall object is placed 18 cm in front of a concave mirror of focal length 12 cm
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1
|
1826
|
April 3, 2019
|
|
An object 4 cm in height, is placed at 15 cm in front of concave mirror of focal length 10 cm
|
|
1
|
1594
|
April 3, 2019
|
|
If the image formed by a lens for all positions of the object placed in front of it is always virtual
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1
|
10026
|
April 3, 2019
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|
The image formed by a spherical mirror is real, inverted and is of magnification - 2
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1
|
4138
|
April 3, 2019
|
|
A student wants to project the image of a candle flame on a screen 80 cm
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1
|
679
|
April 3, 2019
|
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An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm
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1
|
1230
|
April 3, 2019
|
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If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished
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1
|
1266
|
April 3, 2019
|
|
To construct ray diagrams, two rays of light are generally so chosen that it is easy
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1
|
2209
|
April 3, 2019
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|
To construct a ray diagram use two rays of light which are so chosen that it is easy to determine their directions
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1
|
625
|
April 3, 2019
|
|
A student wants to project the image of a candle flame on a screen 60 cm
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|
1
|
1382
|
April 3, 2019
|
|
A ray of light incident on a concave lens is (i) passing through its optical centre
|
|
1
|
1865
|
April 3, 2019
|
|
A spherical mirror produces an image of magnification-Ion a screen placed at a distance of 40 cm from the mirror:
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|
1
|
781
|
April 3, 2019
|
|
A spherical mirror produces an image of magnification on a screen placed at a distance of 50 cm from the mirror
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1
|
1220
|
April 3, 2019
|
|
State the laws of refraction of light. If the speed of light in vacuum is 3 x 108ms-1
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1
|
620
|
April 3, 2019
|
|
An object of height 6 cm is placed perpendicular to the principal axis of a concave lens of focal length 5 cm
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|
1
|
10453
|
April 3, 2019
|
|
An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm
|
|
1
|
1481
|
April 3, 2019
|
|
Mention the types of mirrors used as (i) rear view mirrors
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|
1
|
675
|
April 3, 2019
|
|
A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 12 cm
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|
1
|
814
|
April 3, 2019
|
|
The image of a candle flame placed at a distance 36 cm from a spherical lens is formed
|
|
1
|
1569
|
April 3, 2019
|
|
The image of a candle flame placed at a distance 30 cm from a spherical lens is formed on a screen
|
|
1
|
956
|
April 3, 2019
|
|
At what distance should an object be placed from a lens of focal length 25 cm
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|
1
|
2755
|
April 3, 2019
|
|
A convex mirror used on a bus has a focal length of 200 cm
|
|
1
|
12783
|
April 3, 2019
|
|
An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image
|
|
1
|
1085
|
April 3, 2019
|
|
A concave lens has focal length of 20 cm
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|
1
|
1097
|
April 3, 2019
|
|
A 5.0cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm
|
|
1
|
913
|
April 3, 2019
|
|
An object is placed at a distance of 15 cm from a convex lens of focal length 20 cm
|
|
1
|
2700
|
April 2, 2019
|
|
An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm
|
|
1
|
6937
|
April 2, 2019
|
|
The refractive indices of glass and water with respect to air are 3/2 and 4/3 respectively
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|
1
|
1127
|
April 2, 2019
|
|
What is meant by power of lens? What does its sign (+ ve or -ve) indicate?
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|
1
|
5705
|
April 2, 2019
|
|
State two positions in which a concave mirror produces a magnified image of a given object
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|
1
|
689
|
April 2, 2019
|