MEDIUM
12th Meghalaya Board
IMPORTANT
Earn 100
Derive an expression for the magnifying power of an astronomical telescope in normal adjustment.
Important Questions on Ray Optics and Optical Instruments
MEDIUM
12th Meghalaya Board
IMPORTANT
State Snell’s law of refraction. A spherical surface of radius of curvature separates a rarer and a denser medium as shown in the figure below :
Complete the path of the ray of light, showing the formation of a real image. Derive the relation connecting object distance , image distance , radius of curvature and the refractive indices and of the two media.
HARD
12th Meghalaya Board
IMPORTANT
Find an expression for combined focal length of two thin coaxial convex lenses placed in contact.
HARD
12th Meghalaya Board
IMPORTANT
Derive the lens maker's formula for a thin biconvex lens.
HARD
12th Meghalaya Board
IMPORTANT
With the help of a neat diagram, explain the working of a compound microscope. Obtain an expression for a magnifying power when the final image is formed at least distance of distinct vision.
EASY
12th Meghalaya Board
IMPORTANT
When light travels from an optically rarer medium to an optically denser medium, the velocity of light decreases because of change in
MEDIUM
12th Meghalaya Board
IMPORTANT
Show that the effective power of two thin lenses in contact is the sum of the power of each lens.
HARD
12th Meghalaya Board
IMPORTANT
Derive the relation between critical angle and refractive index.
HARD
12th Meghalaya Board
IMPORTANT
Draw a ray diagram to show the refraction of light through a glass prism. Hence, obtain the relation for angle of deviation in terms of angle of incidence, angle of emergence and angle of prism. What is the refractive index of the material of the prism?
