NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1127  1130 of 2184
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Question number: 1127
» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes
Question
In a compound microscope the objective and the eyepiece have focal lengths of 0.95 cm and 5 cm respectively, and are kept at a distance of 20 cm. The last image is formed at a distance of 25 cm from the eyepiece. Calculate the total magnification.
Choices
Choice (4)  Response  

a.  84 

b.  88 

c.  94 

d.  75 

Question number: 1128
» Ray Optics » Deviation and Dispersion of Light by a Prism
Question
The dispersive powers of crown and flint glasses are 0.03 and 0.05 respectively. The refractive indices for yellow light for these glasses are 1.517 and 1.621 respectively. It is desired to form an achromatic combination of prisms of crown and flint glasses which can produce a deviation of 1° in the yellow ray. The refracting angle of the flint glass prism is,
Choices
Choice (4)  Response  

a.  2.4° 

b.  3.4° 

c.  5.2° 

d.  1.4° 

Question number: 1129
» Ray Optics » Total Internal Reflection
Question
An optical fiber consists of core of μ _{1} surrounded by a cladding of μ < μ _{1}. A beam of light enters from air at an angle α with axis of fiber. The highest a for which ray can be travelled through fiber is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 1130
» Atoms and Nuclei » Bohr Model
Question
In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a _{0} is the radius of the ground state orbit, m is the mass, e is the charge on the electron and s _{0} is the vacuum permittivity, the speed of the electron is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

