Ray-Optics-And-Optical-Instruments-Quiz-1

Ray Optics And Optical Instruments Quiz-1

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. 

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 

Q1. A dentist has a small mirror of focal length 16 mm. He views the cavity in the tooth of a patient by holding the mirror at a distance of 8 mm from the cavity. The magnification is

•  1
•  1.5
•  2
•  3

Solution
                         

Q2.In an eye-piece, field lens and eye lens have focal lengths 7.5 cm and 7.3 cm. To eliminate spherical aberration, distance between them would be

•  0.2 cm
•  0.4 cm
•  0.1 cm
•  0.5 cm

Solution
d=f₁-f₂2=7.5-7.3=0.2 cm

Q3.  When sunlight is scattered by atmospheric atoms and molecules, the amount of scattering of light of wavelength 440 nm is A. The amount of scattering for the light of wavelength 660 nm is approximately

•  4/9 A
•  2.25 A
•  1.5 A
•  A/5

Solution
                             

Q4. A double convex lens, lens made of a material of refractive index μ₁, is placed inside two liquids or refractive indices μ₂ and μ₃, as shown. μ₂>μ₁>μ₃. A wide, parallel beam of light is incident on the lens from the left. The lens will give rise to

•  A single convergent beam
•  Two different convergent beams
•  Two different divergent beams
•  A convergent and a divergent beam

Solution
As μ₂>μ₁, the upper half of the lens will become diverging As μ₁>μ₃, the lower half of the lens will become converging

Q5.A convex lens of focal length 30 cm produces 5 times magnified real image of an object. What is the object distance?

•  36 cm
•  25 cm
•  30 cm
•  150 cm

Solution
                           

Q6. Light travels in two media A and B with speeds 1.8×10⁸ ms^-1 and 2.4×10⁸ ms^-1 respectively. Then the critical angle between them is

•  sin^-1(2/3)
• tan^-1(3/4)
•  tan^-1(2/3)
•  sin^-1(3/4)

Solution
                              

Q7.We combined a convex lens of focal length f₁ and concave lens of focal lengths f₂ and their combined focal length was F.The combination of these lenses will behave like a concave lens, if

•  f₁>f₂
•  f₁<f₂
•  f₁=f₂
•  f₁≤f₂

Solution
                        

Q8.A biconvex lens form a real image of an object placed perpendicular to its principal axis. Suppose the radii of curvature of the lens tend to infinity. Then the image would

•  Disappear
•  Remain as real image still
•  Be virtual and of the same size as the object
•  Suffer from aberrations

Solution
                          

Q9.A divergent lens will produce

•  Always a virtual image
•  Always real image
•  Sometimes real and sometimes virtual
•  None of the above

Solution
A concave lens always from virtual image for real objects

Q10. An astronomical telescope has an angular magnification of magnitude 5 for distant objects. The separation between the objective and the eye-piece is 36 cm and the final image is formed at infinity. The focal length f₀ of the objective and the focal length f_e of the eye-piece are

•  f₀=45 cm and f_e=-9 cm
•  f₀=-7.2 cm and fe=5 cm
• f₀=50 cm and f_e=10 cm
•  f₀=30 cm and f_e=6 cm

Solution