HARD
12th ICSE
IMPORTANT
Earn 100

The distance between the objective of a compound microscope and the real image formed by it is 18 cm. If f0=0.4 cmfe=2.0 cm, then calculate the magnifying power of the microscope for final image formed at the least distance of distinct vision.

Important Questions on Optical Instruments

HARD
12th ICSE
IMPORTANT

A compound microscope has an objective of focal length 2.0 cm and an eye-piece of focal length 6.25 cm separated by a distance of 5 cm. Find the location of an object with respect to the objective so that the final image is formed at least distance of distinct vision. What is the magnifying power of the microscope?

HARD
12th ICSE
IMPORTANT

On seeing with unaided eye, the visual angle of moon at the eye is 0.6°. The focal lengths of the objective and the eye-piece of a telescope are respectively 200 cm and 5 cm. What will be the visual angle on seeing moon through the telescope?

EASY
12th ICSE
IMPORTANT

An astronomical telescope set for normal adjustment has a magnifying power 10. If the focal length of the objective is 1.20 m, what is the focal length of the eyepiece?

EASY
12th ICSE
IMPORTANT

The focal lengths of the objective and the eye-piece of an astronomical telescope are 2.5 m and 5 cm respectively. What is the magnifying power of the telescope when the image is formed at infinity?

HARD
12th ICSE
IMPORTANT

The focal lengths of the objective and the eye-piece of an astronomical telescope are 75 cm and 5 cm respectively. Calculate the magnifying power and the length of the telescope when the final image is formed at least distance of distinct vision (25 cm)

EASY
12th ICSE
IMPORTANT

The focal lengths of the objective and the eye-piece of an astronomical telescope are 75 cm and 5 cm respectively. Calculate the magnifying power and the length of the telescope when the final image is formed at infinity.

EASY
12th ICSE
IMPORTANT

An astronomical telescope consists of two convex lenses having focal length 80 cm and 4 cm. When it is in normal adjustment, What is its length?

EASY
12th ICSE
IMPORTANT

An astronomical telescope consists of two convex lenses having focal length 80 cm and 4 cm. When it is in normal adjustment, What is its magnifying power?