Why red light is used for danger signals?

Important Questions on Eye and Optical Instruments

EASY

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 3

A endoscope is a narrow telescope or a simple microscope?

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 4

A spectrum is formed by a prism whose dispersive power is $w$. If the deviation of the mean ray is $8$, the angular dispersion of the spectrum is _____.

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 5

The magnifying power of an astronomical telescope is $8$ and the distance between two lenses is $54\mathrm{cm}$. What is the focal length of the eye lens and objective?

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 6

To increase magnifying power of a simple microscope what type of eye-piece you will choose: Higher or smaller focal length?

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 7

For a telescope, in which case the magnifying power is maximum: Normal adjustment or Near point adjustment.

EASY

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 8

Why objective of a large aperture is taken in a telescope?

EASY

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 9

Why eyepiece of a small aperture is taken?

EASY

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 10

A star subtends an angle of $2°$ at eye when seen through the telescope. It subtends an angle of $40°$ at eye. The magnifying power of the telescope is _____.