/10 Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 12345678910 Chapter 9 : Ray Optics and Optical Instruments This Quiz Contains a set of 10 Questions. The Passing Cut-off is 60%. To start the Quiz, click on the Start Button. All the Best! 1 / 10 For water (n = 1.33) to air, the critical angle C ≈ 42° 49° 60° 30° 2 / 10 A thin lens of an unkown material with refractive index n is immersed in water (refractive index = 1.33). The lens-maker relation becomes 1f=(n−1)(1R1−1R2) 1f=(n1.33−1)(1R1−1R2) 1f=(1.33n−1)(1R1−1R2) unchanged from air 3 / 10 Object at 10 cm from a convex lens gives image at 30 cm on other side. f = 5 cm 7.5 cm 15 cm 20 cm 4 / 10 If two lenses of focal length 20 cm and 30 cm are placed side by side in contact. Their effective focul length will be: 10 cm 25 cm 12 cm 50 cm 5 / 10 Mirror formula is 1/u + 1/v = 1/f 1/u − 1/v = 1/f v + u = f uv = f 6 / 10 A concave mirror (f = 20 cm). For u = 15 cm, the image is at infinity real & erect virtual & erect real & inverted 7 / 10 Angle between incident and emergent ray through prism is refracting angle deviation angle dispersion angle none 8 / 10 A prism has (A=60 degrees), (μ=1.62). The minimum deviation δₘ (approx.) is 30° 36° 40° 48° 9 / 10 Astronomical telescope in normal adjustment has final image at finite distance infinity focus of objective inside tube 10 / 10 Power (P) of a lens is given by P = 1/f (m) P = f P = −1/f P = n/f Your score is 0% Restart quiz
