Q1. If a ray of light is incident on a plane mirror at an angle of 30° then deviation produced by a plane mirror is .............
(A) 60°
(B) 90°
(C) 120°
(D) 150°
Q2. The frequency of a light wave in a material is 4×10^{4}H_{Z} and wavelength is 5000 Adeg. The refractive index of material will be ...................(Take_{c} = 3×10^{8} ms^{-1}
(A) 1.5
(B) 1.7
(C) 1.33
(D) None of these
Q3. Mono choromatic light of wavelength 399nm is incident from air on a water (n = 1.33) surface. The wavelength of refracted light is ........... nm
(A)300
(B) 600
(C) 333
(D) 443
Q4. If the refractive index of a material of an equilateral prism is √3, then angle of minimum deviation will be ..............
(A) 50°
(B) 60°
(C) 39°
(D) 49°
Q5. If the critical angle for total internal from a medium to vacuum is 30deg then velocity of light in the medium is ....... ms^{-1} (take c = 3.0 × 10^{8}ms^{-1})
Q6. Two plane-convex lenses of radius of curvature R and refractive index 1.5 will have equivalent focal length equal to R, when they are placed ..................
(A) At distance R
(B) At distance R/4
(C) AT distance R/2
(D) In contact with each other
Q7. A double convex lens made of glass of refractive index 1.6 has radius of curvature 15 cm each. The focal length of this lens when immersed in a fluuid of refractive index 1.63 is .......
(A) -40.75
(B) -407.5
(C) -125
(D) 12.5
Q8. Which of the following colours is scattered minimum ?
(A) Violet
(B) red
(C) blue
(D) yellow
9. Angle of minimum deviation for a prism index 1.5 is equal to the angle of the prism then the angle of prism ............(given , sin 48°, 36' = 0.75)
(A) 62°
(B) 82°
(C) 60°
(D) 41°
Q10. An observer look at a tree of height 10 meters away with a telescope of magnifying power 10. To him, the tree appears ........
(A) 10 times taller
(B) 10 times smaller
(C) 10 times nearer
(D) 20 times nearer
ANSWER
(Ans 1.) C
(Ans 2.) A
(Ans 3.) A
(Ans 4.) B
(Ans 5.) B
(Ans 6.) D
(Ans 7.) B
(Ans 8.) B
(Ans 9.) B
(Ans 10.) C