Test: Reflection of Light by Spherical Mirrors (NCERT) - NEET MCQ

# Test: Reflection of Light by Spherical Mirrors (NCERT) - NEET MCQ

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## 5 Questions MCQ Test NCERTs at Fingertips: Textbooks, Tests & Solutions - Test: Reflection of Light by Spherical Mirrors (NCERT)

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Test: Reflection of Light by Spherical Mirrors (NCERT) - Question 1

### What can be the largest distance of an image of a real object from a convex mirror of radius of curvature is 20 cm?

Detailed Solution for Test: Reflection of Light by Spherical Mirrors (NCERT) - Question 1

In a convex mirror image is formed only between focus and mirror. So the maximum distance is f i.e, 20/2 = 10cm.

Test: Reflection of Light by Spherical Mirrors (NCERT) - Question 2

### A boy of height 1 m stands in front of a convex mirror. His distance from the mirror is equal to its focal length. The height of his image is

Detailed Solution for Test: Reflection of Light by Spherical Mirrors (NCERT) - Question 2

Let f be focal length of the convex mirror.
According to new cartesian sign convention
Object distance, u = −f, focal length = +f
Using mirror formula,

The image is formed at a distance f/2 behind the mirror. It is a virtual image.

∴ h1 = mh0

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Test: Reflection of Light by Spherical Mirrors (NCERT) - Question 3

### A concave shaving mirror has a radius of curvature of 35.0 cm. It is positioned so that the (upright) image of a man’s face is 2.50 times the size of the face. How far is the mirror from the face?

Detailed Solution for Test: Reflection of Light by Spherical Mirrors (NCERT) - Question 3

For spherical mirror, f = R/2
Given, R = 35.0cm or
|f| = 35/2 = 17.5cm

Also, magnification m = −v/u or v = −mu

= −17.5×(0.6)
= −10.5cm

Test: Reflection of Light by Spherical Mirrors (NCERT) - Question 4

A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such way that it end closer to pole is 20 cm away from the mirror. The length of the image is

Detailed Solution for Test: Reflection of Light by Spherical Mirrors (NCERT) - Question 4

Here, f = -10 cm
For end A ,uA = - 20 cm
Image position vA of end A is given by

vA = -20 cm
For end B, uB = -30 cm
Image position vB of end B is given by

vB = −15cm
Length of the image
= |vA| − |vB| = 20cm − 15cm = 5cm

Test: Reflection of Light by Spherical Mirrors (NCERT) - Question 5

An object 2 cm high is placed at a distance of 16 cm from a concave mirror, which produces a real image 3 cm high. What is the focal length of the mirror?

Detailed Solution for Test: Reflection of Light by Spherical Mirrors (NCERT) - Question 5

Here, h1​ = 2 cm, u = -16 cm,
h2 = -3 cm (Since image is real and inverted.)

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