Indian Navy 10+2 B.Tech Cadet Optics — practice questions — page 2

Explore 32 free Optics questions in Indian Navy 10+2 B.Tech Cadet Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Showing questions 31–32 of 32.

Assertion and reason: instrumentsRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →

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Assertion and reason: instruments

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Questions

Reason
Its magnifying power is f₀ divided by fₑ.
Verdict
Both are true; the reason explains the assertion.
Assertion
A telescope needs a long focal length objective for high magnification.
Reason
It multiplies the objective and eyepiece magnifications together.
Verdict
Both are true; the reason explains the assertion.
Assertion
A compound microscope out-magnifies a simple one.
Reason
Dispersion splits white light into its colours.
Verdict
Both are true; the reason does not explain the assertion.
Assertion
The dioptre is the SI unit of lens power.

The last round pairs two true halves that do not explain one another. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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Which quantity is being described?

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Items

Item
Critical angle i_c
Category
An angle
Item
Angle of minimum deviation
Category
An angle
Item
Focal length f
Category
A distance
Item
Radius of curvature R
Category
A distance
Item
Measured in dioptres
Category
A power
Item
Adds for lenses in contact
Category
A power

Categories

Item
An angle
Item
A distance
Item
A power

Critical angle, focal length and power are all single numbers describing very different things. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.