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If the light prpagating along a straight...

If the light prpagating along a straight ine bends by a small but fixed angle,it may be due to

A

reflection

B

refraction

C

dispersion

D

diffraction

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Photoelectric effect When light of sufficeintly small wavelength is incident on a metal cathode, it may emit electons called photoelectrons. Above threshold frequency the stopping potenital and hence the energy of the photoelectrons are directly proportional to the frequency. in the given figure, we see the variation of stopping potential with the frequency of incident radiation for three metals A, B and C. Slope of graph is given by

MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. In case of spherical mirrors,which of the followed do/does not depend ...

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  2. Light appears to travel in a straight lines,since

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  3. If the light prpagating along a straight ine bends by a small but fixe...

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  4. A glass slab of thickness 4 cm contains the same number of waves as 5 ...

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  5. The lateral shift produced in a parallel sided glass slab depends on

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  6. Light passing from air to glass is refracted ,as is light passing from...

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  7. A person swimming at the bottom of a swimming pool lookds up to the di...

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  8. Total interval reflection takes place, when light travels from

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  9. A ray of light from a sodium lamp undergoes total internal reflection....

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  10. A ray of light falls on a right angled prism ABC (AB=BC) and travels a...

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  11. For the given incident ray as shown in the figrue,the condition of tot...

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  12. The critical angle of light passing from glass to air is minimum for

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  13. Which of the following phenomenon is used in optical fiber?

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  14. A glass prism of refractive index 1.5 is immersed in water (mu= 4//3)....

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  15. A,B and C in the diagram represent rays of light incident upon a face ...

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  16. Refractive index of water is 5//3. A light source is placed in water a...

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  17. A fish looking up through the water sees the outside world contained i...

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  18. A diver in swimming pool wants to signal his distress to a person lyin...

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  19. An equiconvex lens has focal length equal to the radius of curvautre.I...

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  20. What is the focal length of a double convex lens for which radius of c...

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