EASY
12th Andhra Pradesh Board
IMPORTANT
Earn 100

You are given prisms made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prism which will disperse (and displace) a pencil of white light without much deviation.

Important Questions on Ray Optics and Optical Instruments
MEDIUM
12th Andhra Pradesh Board
IMPORTANT
For a normal eye, the far point is at infinity and the near point of distinct vision is about in front of the eye. The cornea of the eye provides a converging power of about Dioptres, and the least converging power of the eyes-lens behind the cornea is about Dioptres. From the rough data estimate the range of accommodation (i.e., the range of converging power of eye-lens) of a normal eye.

EASY
12th Andhra Pradesh Board
IMPORTANT
Does short-sightedness (myopia) or long-sightedness (hypermetropia) imply necessarily that the eye has partially lost its ability of accommodation? If not, what might cause these defects of vision?

MEDIUM
12th Andhra Pradesh Board
IMPORTANT
A myopic person has been using spectacles of power dioptre for distant vision. During old age he also needs to use separate reading glass of power dioptres. Explain what may have happened.

MEDIUM
12th Andhra Pradesh Board
IMPORTANT
A person looking at a person wearing a shirt with a pattern comprising vertical and horizontal lines is able to see the vertical lines more distinctly than the horizontal ones. What is this defect due to? How is such a defect of vision corrected?

MEDIUM
12th Andhra Pradesh Board
IMPORTANT
A man with normal near point () reads a book with small print using a magnifying glass: a thin convex lens of focal length . What is the closest and the farthest distance at which he should keep the lens from the page so that he can read the book when viewing through the magnifying glass?

MEDIUM
12th Andhra Pradesh Board
IMPORTANT
A man with normal near point () reads a book with small print using a magnifying glass: a thin convex lens of focal length . What is the maximum and the minimum angular magnification (magnifying power) possible using the above simple microscope?

HARD
12th Andhra Pradesh Board
IMPORTANT
A card sheet divided into squares each of size is being viewed at a distance of through a magnifying glass (a converging lens of focal length ) held close to the eye.
(a) What is the magnification produced by the lens? How much is the area of each square in the virtual image?
(b) What is the angular magnification (magnifying power) of the lens?
(c) Is the magnification in (a) equal to the magnifying power in (b)? Explain.

MEDIUM
12th Andhra Pradesh Board
IMPORTANT
A card sheet divided into squares each of size is being viewed through a magnifying glass (a converging lens of focal length ) held close to the eye.
(a) At what distance should the lens be held in order to view the squares distinctly with the maximum possible magnifying power?
(b) What is the magnification in this case?
(c) Is the magnification equal to the magnifying power in this case? Explain.
