1
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is
A
5 cm
B
$$-$$ 10 cm
C
20 cm
D
$$-$$ 30 cm
2
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
A thin prism of angle 15o made of glass of refractive index $$\mu $$1 = 1.5 is combined with another prism of glass of refractive index $$\mu $$2 = 1.75. The combination of the prisms produces dispersion without deviation. The angle of the second prism should be
A
5o
B
7o
C
10o
D
12o
3
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
The threshold frequency for a photosensitive metal is 3.3 $$ \times $$ 1014 Hz. If light of frequency 8.2 $$ \times $$ 1014 Hz is incident on this metal, the cut- off voltage for the photoelectron emission is nearly
A
1 V
B
2 V
C
3 V
D
5 V
4
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, then the value of n is
A
2
B
3
C
4
D
5
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