Embibe Experts Solutions for Exercise 1: SAT 2020

A convex lens and a concave lens, each of focal length $10 \mathrm{cm}$, are kept separated by a distance of $2 \mathrm{cm}$ as shown in the figure. If the light is incident from left, the combinations of lenses will be _____. 

A pin AB of length $2 \mathrm{cm}$ is kept on the axis of a convex lens between$18 \mathrm{cm}$ and $20 \mathrm{cm}$ as shown in figure. Focal length of convex lens is $10 \mathrm{cm}$. Find magnification produced for the image of the pin.

Four graphs between $\frac{1}{u}$ and$\frac{1}{v}$ given for spherical mirrors. Which one of them suitable represents a convex mirror, as per the new Cartesian sign convention?

An object is placed at point A in front of a convex lens of focal length f. Its real, inverted, and magnified image is formed behind the lens. When the object is brought closer to the lens and placed at point B, virtual and erect images, but with the same magnification (in magnitude) as before are formed in front of the convex lens. Let F be the focus of the lens in front of it. Which of the following relations is correct?

Nethra, who is a back-bencher, discovers one day in the class that she is unable to discern the details on the blackboard very well. When she visits an optician, he prescribes glasses for her. Which of the following statement(s) is/are false? 
I. She suffers from myopia where the far point is nearer than the blackboard.
II. A concave lens with a suitable power a help corrects her vision.
III. Her eye is defective and is forming images in front of the retina.
IV. A concave lens or a convex lens may be used to correct her vision. 

A small pencil of length $10 \mathrm{cm}$ is kept along the axis of a concave mirror of radius of curvature $40 \mathrm{cm}$ with its tip touching the mirror. The size of pencil' s image would appears to be: