Ray Optics (NEET Physics): Questions 72  76 of 102
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Question number: 72
» Ray Optics » Lens Maker's Formula and Lens Formula
Question
For a Planoconvex lens of radius of curvature 10 cm, the focal length is 30 cm, if the refractive index of the material of the lens is,
Choices
Choice (4)  Response  

a.  1.5 

b.  1.33 

c.  1.66 

d.  2.0 

Question number: 73
» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes
Question
Resolving power of a microscope doesn’t depend upon
(1) Velocity of light used
(2) Frequency of light used
(3) Focal length of objective
(4) Wavelength of light used
Select the correct answers and mark it according to the following codes:
Codes:
Choices
Choice (4)  Response  

a.  1 and 3 are correct 

b.  1 and 2 are correct 

c.  2 and 4 are correct 

d.  1, 2 and 3 are correct 

Question number: 74
» Ray Optics » Deviation and Dispersion of Light by a Prism
Question
A glass prism of refractive index 1.5 and angle of prism 6° is put in contact with another prism of refractive index 1.6 when a ray of light is made incident on this combination normally then it emerges out undeviated. The angle of second prism will be
Choices
Choice (4)  Response  

a.  3° 

b.  5° 

c.  6 ^{0} 

d.  4° 

Question number: 75
» Ray Optics » Snell's Law
Question
A ray of light incident on a prism surface at an angle of 50° in the minimum deviation position. If the angle of prism is 60° then the values of δ _{m} and µ will be respectively (sin 50° = 0.766)
Choices
Choice (4)  Response  

a.  60° and 1.532 

b.  0° and 1.532 

c.  40° and 1.532 

d.  90° and 1.532 

Question number: 76
» Ray Optics » Mirror Formula
Question
A small point object is placed at O, at a distance of 0.60 meter in air from a convex spherical surface of refractive index 1.5. If the radius of the curvature is 25 cm, then what is the position of the image on the principal axis?
Choices
Choice (4)  Response  

a.  1.5 m 

b.  4.5 m 

c.  2.5 m 

d.  5.5 m 
