EASY
12th Nagaland Board
IMPORTANT
Earn 100
Derive the lens maker’s formula for a thin double convex lens. Why is it called so?
Important Questions on Ray Optics and Optical Instruments
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 ]
EASY
12th Nagaland Board
IMPORTANT
A small telescope has an objective lens of focal length and eyepiece of focal length . What is the magnifying power of telescope when image is at infinity and image is formed at least distance of distinct vision?
MEDIUM
12th Nagaland Board
IMPORTANT
Explain the reflective telescope with diagram and write its advantages over refractive telescope. On what factors does its resolving power depend?
