When the angle of incidence increases so that it now exceeds the critical angle

Question

When the angle of incidence increases so that it now exceeds the critical angle the energy previously associated with the refracted ray a) vanishes B) remains with the refracted ray. e) increases brightness of the refilled ray when may diverging lens yield a real image a) never b) with a real object closer than the focal length c) with a virtual object closer than the focal length b) with a real object diner than the focal length c) with a virtual object farther than the focal length d) with a virtual object closer than the focal length 9. Of the following, which combination b always capable of producing both real and virtual images? a) real objects with converging lenses b) virtual objects with converging lenses c) real objects with diverging lenses d) erect objects with diverging lenses 10. The magnification of an image is found to be - 2.00. Which of the following must be true? a) The image is diminished and inverted. b) The image is diminished and erect. c) The image is magnified and virtual. d) The image is magnified and inverted 11. An electromagnetic wave is made up of which of the following oscillating quant.lt. a. electrons only b. electric fields only c. magnetic fields only d. electric and magnetic fields 12. A cell phone transmits at a frequency of 1.50 x10^8 Hz. What is the wavelength of the electromagnetic wave used by this phone? a. 1.00 m b. 2.00 m c. 10.0 m d. 0.100 m The magnetic field in an electromagnetic wave has a peak value given by B = 7.5 muT For this wave, find the peak electric field strength a. 2250V/m b. 1250 V/m c. 4250 V/m d. 3250 V/m

Explanation / Answer

8)
Diverging lens allways yields a Virtual Image, so
Correct option - (a) Never.

9)
Converging Lens is capable of forming both Real Image(When object is behind Focal length.) & Virtual Image (When object is infront of Focal length.)

So Correct Option :- a)Real Objects with Converging Lens.

10)
As the Magnification = -2

Image is Magnified
-ve sign shows Image is Inverted.

Correct option - (d) Image is Magnified & Inverted.

11)
EM Waves are made up of Both Electric & Magnetic Field.
Correct option - (d)

12)
v = f*
3.0 * 10^8 = 1.5 * 10^8 *
= 2.0 m
Correct option - (b)

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