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