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1.
A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a
2.
What is the phenomenon of the moon to appear bigger in size as it approaches the horizon, called?
3.
Which one among the following is used to make periscope?
4.
What is the essential difference between a terrestrial telescope and an astronomical telescope?
5.
6.
A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens?
7.
An object is kept 5 cm in front of a concave mirror of focal length 15 cm. What will be the nature of the image?
8.
The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for
9.
10.
Refractive index of an optical medium changes with
1. the nature of the medium.
2. the change in the angle of incidence of the ray.
3. colour of the incident ray.
Select the correct answer using the code given below:
1. the nature of the medium.
2. the change in the angle of incidence of the ray.
3. colour of the incident ray.
Select the correct answer using the code given below: