A) the centre of the curvature. B) the optical centre of the lens. C) a point where parallel rays converge. D) a point 20 cm away from the lens.
A) A B) C C) D D) B
A) virtual, diminished and upright. B) real, diminished and upright. C) real, diminished and inverted. D) virtual, diminished and inverted.
A) real, upright, magnified. B) real, inverted, magnified. C) virtual, inverted, magnified. D) virtual, inverted, diminished.
A) The top half of the original image will disappear. B) The whole original image can still be seen but the new image size is half its original image size. C) The bottom half of the original image will disappear. D) The whole original image can still be seen and the new image size is equal to its original image size.
A) less than the image distance. B) equal to the focal length of the lens. C) equal to the image distance. D) less than the focal length of the lens.
A) OP B) OS C) OR D) OQ
A) 75 mm B) 25 mm C) 50 mm D) 100 mm
A) distance of the object from the lens. B) thickness of the lens. C) refractive index of the material used to make the lens. D) material used to make the lens.
A) 12 cm B) 5 cm C) 14 cm D) 6 cm |