Home › CBSE Class 12 (Science) › Physics › Ray Optics and Optical Instruments › For relaxed viewing at infinity, a magnifier's o…
For relaxed viewing at infinity, a magnifier's object is placed
AAt the focal point
BAt the optic centre
CAt 2f from the lens
DAt 25 cm in front
Answer & Solution
Correct answer: A. At the focal point
Rays leave parallel only if the object sits at the focus of the lens.
Related questions
A prismatic corner reflector turns incoming light back along its path using how many totalIn a wiper rain sensor, water drops do what to the infrared beam?Which device uses the critical angle to measure the refractive index of a substance?Which prism pair is commonly used to turn the view upright in binoculars?At the critical angle, the refracted ray travels in which direction?A swimmer looking up from below calm water sees the outside world compressed into a cone. Optical fibres carry signals over long distances by which principle?Diamond has a refractive index of about 2.42. Roughly what is its critical angle in air?