Light: Reflection And Refraction, Test 1
10 Questions MCQ Test | Light: Reflection And Refraction, Test 1
The speed of light in vacuum is
The speed of light in vacuum is always 3 × 108 m/s.
According to laws of reflection
Focal length of plane mirror is
The nature of image formed by concave mirror is always ................. and ................... irrespective of the position of the object.
If the image formed by a concave mirror is observed to be virtual, erect and larger than the object then the position of the object will be
If the image formed by a concave mirror is virtual, erect and larger than the object, the position of the object should be between the pole of the mirror and its principal focus.
An object is 9 cm from a magnifying lens and its image is formed 36 cm from the lens. Magnification of the lens is.
m = v/u = 36/9 = 4
If an object is moved away from a convex mirror, then its image ________ .
If an object is moved away from a convex mirror, then its image moves towards the principal focus and becomes smaller in size.
If an object is moved away from a convex mirror, then its image moves towards the principal focus and becomes smaller in size.
Since it is a concave lens, image is virtual. Thus, v = -20 cm, u = -30 cm
1/v - 1/u = 1/f
Put the above quantity in the given formula. You will get the answer.
For one curved mirror, h' = 10 cm, h = 5 cm then its magnification is :
Magnification ,M = hi/hu = 10/5 = 2
If the radius of curvature of a spherical mirror is 34.52 cm, then the focal length of that spherical mirror is
Relation between the radius of curvature and focal length of spherical mirror is R = 2f
Here, R = 34.52 cm
Or, f = R/2
Or, f = 34.52/2 = 17.26 cm
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