WorksheetsLight Reflection and Refraction
Total questions: 40
Worksheet time: 22mins
When a very small opaque object is placed on the path of light, light has a tendency to bend around it . This phenomenon of light is known as
Reflection of light
Refraction of light
Deflection of light
Diffraction of light
What is the relationship between radius of curvature and focal length
2R=f
R=f/2
R=2f
f=R/2
The diameter of reflecting surface of spherical mirror is called its
(a)
Dealing with the reflection of light by spherical mirrors, we follow a set of sign conventions called
(a)
By the New Cartesian Sign Convention light form the object falls on the mirror from
Left side
Right side
Downwards
Upwards
In a Concave Mirror experiment, an object is placed at a distance x₁ from the focus and the image is formed at a distance x₂ from the focus. The focal length of the mirror would be
x₁x₂
√ x₁x₂
x₁+x₂/2
√ x₁/x₂
A negative sign in the value of magnification indicates that the image is
(a)
A positive sign in the value of the magnification indicates that the image is
(a)
If the magnification of image is 3 and image is 15cm, then find the object height
h' = 4cm
h' = 2cm
h' = 5cm
h' = 2.5cm
(3/4)f
(4/3)f
f
(7/3)f
A man runs towards a mirror at a speed of 15m/s. What is speed of his image?
7.5m/s
5m/s
15m/s
45m/s
75⁰
15⁰
30⁰
45⁰
Magnifying power of concave lens is
always > 1
always < 1
always = 1
Can have any value
A point object is placed at a distance of 20cm form a convex mirror of focal length 20cm. The image will form
At Infinity
At Focus
At Pole
Behind the mirror
If the power of a lens is -2D, what is its focal length?
+50cm
-100cm
-50cm
+100cm
A spherical mirror and a spherical lens each have a focal length of -10cm. The mirror and the lens are likely to be:
Both concave
Both convex
The mirror is concave & lens is convex
Mirror is convex and lens is concave
Concave lens
Rectangular glass slab
Prism
Convex lens
Magnification produced by a rear view mirror fitted in vehicles is
Less than one
More than one
Equal to one
None of these
In torches, search lights and head lights of vehicles bulb is placed
Between pole & focus of reflector
Very near to focus of reflector
Between focus & centre of curvature of reflector
At the centre of curvature of reflector
You are given water, mustard, oil, glycerine & kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?
Kerosene
Water
Mustard oil
Glycerine
Light travels fastest in
Water
Diamond
Glass
Air
When rays of light after reflection meet at a point , then the image formed is
(a)
Which mirror is used by dentists to see large images of teeth of patients?
(a)
__________ is the ratio of height of image to height of object
Image distance
Object distance
Magnification
Angle of reflection
Which is the point on principal axis of lens where all rays of light parallel to the principal axis meets or appear to meet.
Pole
Focus
Centre of curvature
The deviation of light ray from its path when it travels from one medium to another.
Reflection
Refraction
Deflection
Diffraction
Less than 100mm
Between 100mm and 200mm
Exactly 200mm
More than 200mm
10cm
20cm
30cm
35cm
A concave mirror produces a magnification of +4. The object is placed
At the focus
Between focus & center of curvature
Between focus & pole
Beyond centre of curvature
A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light
Is refracted towards normal
Is refracted away from normal
Is reflected along the same path
Does not get refracted
A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of
120⁰
90⁰
45⁰
0⁰
20cm
18cm
10cm
5cm
A
B
C
D
For a real object, which of following can produce a real image?
Plane mirror
Concave mirror
Convex mirror
Concave lens
In an astronomical telescope the focal length of objective lens is 100cm and that of eye piece is 2cm. The magnifying power of telescope for normal eye is:
1/50
100
10
50
In which of the following, which mirror makes diminished and virtual image of an object?
Plane
Concave
Convex
None of these
The image of an object is formed virtual and enlarged by:
Convex mirror
Concave mirror
Plane mirror
Convex lens
The focal length of concave mirror is 10cm.The radius of curvature of mirror will be:
10cm
30cm
40cm
20cm
The focal length of plane mirror is:
Zero
25cm
Infinite
0.4 m
The ability of a medium to refract light is also expressed in terms of its
Rarer Medium
Denser Medium
Optical Density
Absolute Refractive Index
