Q1. The speed of light in vacuum is:
Q2. According to the law of reflection, the angle of incidence is:
Q3. An image that can be projected on a screen is called:
Q4. The focal length of a plane mirror is:
Q5. Magnification for a plane mirror is:
Q6. A concave mirror can form a virtual image when the object is:
Q7. For a convex mirror, the focal length is:
Q8. Refraction of light occurs due to:
Q9. Snell's law is given by:
Q10. Light bends towards the normal when it:
Q11. Total internal reflection occurs when:
Q12. The critical angle for glass (n=1.5) to air is:
Q13. A lens formula is:
Q14. Power of a lens with focal length 50 cm is:
Q15. A convex lens always forms:
Q16. A concave lens forms:
Q17. Magnification of -2 for a mirror/lens means:
Q18. In a telescope, the objective has focal length 100 cm and eyepiece has focal length 5 cm. The magnification is:
Q19. A periscope uses:
Q20. Optical fibres work on the principle of:
