LIGHT
Light and Optics Mastery Quiz
Test your knowledge of light and optics with our engaging quiz! Covering a range of topics from reflection and refraction to lenses and mirrors, this quiz is designed for learners of all levels.
- 25 multiple choice questions
- Instant feedback on your answers
- Enhance your understanding of optical phenomena
An object is placed 20cm in front of a plane mirror. The mirror is moved 2cm towards the object. The distance between the positions of the original and final images seen in the mirror is
2cm
4cm
10cm
22cm
A ray of light that strikes a plane mirror PQ at an angle of incidence of 30 degree, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angles of reflection at the second mirror is
30 degree
45 degree
60 degree
90 degree
An object is placed at 100mm in front of a concave mirror which produces an upright image ( erect image) > The radius of curvature of the mirror is
Less than 100mm
Between 100 mm and 200 mm
Exactly 200mm
More than 200mm
Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15cm is being used?
10cm
20cm
30cm
35cm
A concave mirror produces a magnification of +4. The object is placed
At the focus
Between focus and centre of curvature
Between focus and pole
Beyond the 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 the normal
Is refracted away from the normal
Is refracted along the same path
Does not get refracted
A lens of focal length 12cm forms an erect image, three times the size of the object. The distance between the object and image is
8cm
16cm
24cm
36cm
If an object is placed 21cm from a converging lens, the image formed is slightly smaller than the object. If the object is place at a distance of 19cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is
20cm
18cm
10cm
5cm
Focal lenght of plane mirror is
At infinity
Zero
Negative
None of these
Image formed by plane mirror is
Real and erect
Real and inverted
Virtual and erect
Virtual and inverted
A concave mirror gives real, inverted and same size image if the object is placed
At F
At infinity
At C
Beyond C
Power of lens is -40, it focal length is
4m
- 40m
-0.25 m
-25m
A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size of the object is called
Optically rarer
Optically denser
Optical density
Refractive index
The optical phenomena, twinkling of stars, is due to
Atmospheric reflection
Total reflection
Atmospheric refraction
Total refraction
Convex lens focus a real, point sized image at focus, the object is placed
At focus
Between F and 2F
At infinity
At 2F
The unit of power of lens is
Metre
Centimetre
Diopter
Per Meter
The radius of curvature of a mirror is 20cm the focal length is
20cm
10cm
40cm
5cm
In optics which has higher refractive index is called
Optically rarer
Optically denser
Optical density
Refractive index
An object is placed at a distance between the object and image will be
0.25m
1.0m
0.5m
0.125m
The angle of incidence for a ray of light having zero reflection angle is
0
30 degree
45 degree
90 degree
For real object, which of the following can produce a real image ?
Plane mirror
Concave mirror
Concave lens
Convex mirror
Which of the following mirror is used by a density to examine a small cavity?
Convex mirror
Plane mirror
Concave mirror
Combination of convex and concave mirror
An object at a distance of 30cm from a concave mirror gets its image at the same point. The focal length of the mirror is
-30cm
30cm
-15cm
15cm
A concave mirror of radius 30cm is placed in water. Its focal length in air and water. Its focal length in air and water differ by
15
20
30
0
As light travels from a rarer to a denser medium it will have
Increased velocity
Decreased velocity
Decreased wavelength
Both (b) and (c)
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