How does the focal length of a convex lens change with increase

Subject

Physics

Class

ICSE Class 12

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 Multiple Choice QuestionsShort Answer Type

11.

What is meant by coherent sources of light? 

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12.

A ray of light is incident on a transparent medium at polarising angle. What is the angle between the reflected ray and the refracted ray? 

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13.

Name the physical principle on which the working of optical fibres is based? 

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14.

What is meant by short-sightedness?

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15.

How does the focal length of a convex lens change with increase in wavelength of the incident light? 


With increase in wavelength of the light, the focal length of the convex lens increases. 

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16.

With reference to the photoelectric effect, what is meant by the threshold wavelength? 

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17.

Half life of a certain radioactive element is 3.465 days. Find its disintegration constant. 

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18.

Binding energy per nucleon for helium nucleus He presubscript 2 presuperscript 4 is 7.0 MeV. Find the value of mass defect for helium nucleus. 

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19.

Write one balanced reaction representing nuclear fusion?

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20.

Draw the truth table of a NOR gate.

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