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