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Subjects
Science State Board
Class 10
Optics
Textbook questions

6. Choose the correct answer II

Exercise condition:

5 m.

1. Power of a lens is \(–4D\), then its focal length is

\(–40\ m\)
\(4\ m\)
\(–0.25\ m\)
\(–2.5\ m\)

2. In a myopic eye, the image of the object is formed

on the blind spot
on the retina
in front of the retina
behind the retina

3. The eye defect ‘presbyopia’ can be corrected by

convex mirror
concave lense
Bifocal lenses
convex lens

4. Which of the following lens would you prefer to use while reading small letters found in a dictionary?

A convex lens of focal length \(5 cm\)
A concave lens of focal length \(10 cm\)
A concave lens of focal length \(5 cm\)
A convex lens of focal length \(10 cm\)

5. If

V_{B}

,

V_{B}

,

V_{R}

be the velocity of blue, green and red light respectively in a glass prism, then which of the following statement gives the correct relation?

$V_{B} < V_{G} > V_{R}$
$V_{B} = V_{G} = V_{R}$
$V_{B} > V_{G} > V_{R}$
$V_{B} < V_{G} < V_{R}$

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