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10 questions
Show answers
- Q1A lens which focuses light to a point is called a what?A converging lensA meniscus lensA biconvex lensA diverging lens30s
- Q2What is the unit of power for a lens?DioptreWattMetreJoule30s
- Q3What is the power of a lens dependent on?The type of wave incident on the lensThe time of dayThe way the lens is being heldThe focal length of the lens30s
- Q4The power of a lens can be calculated using which of the following formulae?Power = 1 / focal length (m)Power = focal length / 1Power = 1 / focal length (cm)Focal length (m) = 1 / Power230s
- Q5What is chromatic aberration?Where light is split into constituent colours after travelling through a lensSeparate rays of coloured light are converged into one beam of chromatic lightWhere chromatic light is split into two colours after travelling through a lensChromatic aberration does not affect light30s
- Q6What is the power of lens which has a focal point of 20cm?5500.50.0530s
- Q7In the eye, which of the following parts does light NOT travel through?The lensThe pupilThe corneaThe iris30s
- Q8What is the focal length of a lens which has a power of 0.5?0.5m2cm0.2m2m30s
- Q9Which of the following parts of the eye are NOT involved in focusing light?Ciliary musclesThe lensThe irisSuspensory ligaments30s
- Q10Calculate the power of a converging lens of focal length 0.05m-2D2D20D-20D30s