HARD
12th Odisha Board
IMPORTANT
Earn 100

With a neat ray diagram, describe the principle, working and use of an astronomical telescope.

Important Questions on Eye and Optical Instruments

MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 1
A short-sighted man can read printed matter distinctly when it is held 15 cm from his eye. Find the focal length of the glasses which he must use if he wishes to read with ease a book at a distance of 60 cm.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 2
A long-sighted person can see clearly at any distance more than 100 cm. What kind of lens should he use in spectacles to be able to read print placed at 25 cm from his eye? What is the power of this lens?
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 3
A person can focus objects only when they lie between 0.5 m and 3 m from his eyes. What spectacles should he use to increase his maximum distance of distinct vision to infinity.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 4
A simple microscope is made of a combination of two lenses in contact of powers +15 D and +5 D. Calculate the magnifying power of the microscope if the image is formed at the least distance of distinct vision 0.25 meter.
HARD
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 5
The objective and eye-piece of a microscope have focal lengths 1 cm and 2 cm respectively and separated by 12 cm. A person, whose distance of distinct vision is 25 cm uses the microscope to see a small object. Where must the object be placed?
HARD
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 7
A telescope has an objective of focal length 50 cm and an eye-piece of focal length 5 cm. The least distance of distinct vision is 25 cm. The telescope is focussed for distinct vision on a scale 200 cm away from the object. Calculate the separation of the objective and the eye-piece.
HARD
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 8
In a compound microscope, an object is placed at a distance of 1.5 cm from the objective of focal length 1.25 cm. If the eyepiece has a focal length of 5 cm and the final image is formed at the near point, estimate the magnifying power of the microscope.
HARD
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 13 - Eye and Optical Instruments>MODEL QUESTIONS>Q 9
A compound microscope with an objective of 1.0 cm focal length and an eye-piece of 2.0 cm focal length has a tube length of 20 cm. Calculate the magnifying power of the microscope, if the final image is formed at near point of the eye.