## Ray Optics And Optical Instruments Quiz-1

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 Î¼1, is placed inside two liquids or refractive indices Î¼2 and Î¼3, as shown. Î¼2>Î¼1>Î¼3. 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 Î¼2>Î¼1, the upper half of the lens will become diverging As Î¼1>Î¼3, 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 fe of the eye-piece are
•  f0=45 cm and fe=-9 cm
•  f0=-7.2 cm and fe=5 cm
• f0=50 cm and fe=10 cm
•  f0=30 cm and fe=6 cm
Solution

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