EASY
12th Nagaland Board
IMPORTANT
Earn 100
Draw a labelled diagram of an astronomical telescope and explain its working. Give an expression for its magnifying power.
Important Questions on Ray Optics and Optical Instruments
EASY
12th Nagaland Board
IMPORTANT
A ray of light is incident on one face of a prism and emerges out from the other face. Draw a ray diagram and derive an expression for refractive index of the material of the prism.
EASY
12th Nagaland Board
IMPORTANT
Derive the lens maker’s formula for a thin double convex lens. Why is it called so?
MEDIUM
12th Nagaland Board
IMPORTANT
Draw a neat ray diagram to show the image formation in a compound microscope. Define its magnifying power and derive an expression for it, when the final image is at near point of eye.
EASY
12th Nagaland Board
IMPORTANT
A convex lens of focal length is in contact with a concave lens of focal length . The power of the combination is
EASY
12th Nagaland Board
IMPORTANT
Deduce the relation between object and image distance in terms of refractive index of the medium and the radius of curvature of curved spherical surface.
EASY
12th Nagaland Board
IMPORTANT
If for a glass lens, what is the power of the lens?
EASY
12th Nagaland Board
IMPORTANT
The radii of curvature of the faces of a double convex lens are and , its focal length is . What is the refractive index of glass?
EASY
12th Nagaland Board
IMPORTANT
A convex lens has focal length in air. What is the focal length in water? [Refractive index of water , Refractive index of air-glass ]
