OPTICS
Master Optics Quiz
Test your knowledge of optics with our engaging quiz! Dive into various topics related to lenses, mirrors, and optical phenomena. Whether you're a student, teacher, or just an enthusiast, this quiz will challenge your understanding and enhance your learning.
Join now and discover:
- Key principles of optics
- Applications of lenses and mirrors
- Interesting facts about light behavior
Focal length 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 the lens is -40, its focal length is
4m
-40m
-0.25m
-25m
A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is
. At infinity
Between F and C
Between P and F
At E
In optics an object which has higher refractive index 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
Centimeter
Diopter
M+1
The radius of curvature of a mirror is 20cm the focal length is
20cm
10cm
40cm
5cm
Mirage is an example
refraction of light only
total internal reflection of light only
refraction of light
dispersion of light only
Two lenses of focal lengths 20 cm and – 40 cm are held in contact. Focal length of combination will be
10 cm
20 cm
40 cm
infinity
In optical fibres, the refractive index of the core is
greater than that of the cladding.
equal to that of the cladding.
smaller than that of the cladding.
independent of that of cladding.
An object is placed at a distance of 0.5 m in front of a plane mirror. The distance between object and image will be
0.25 m
0.5 m
1.0 m
2.0 m
If a convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power?
+ 6.5 D
– 6.5 D
+ 7.5 D
– 0.75 D
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