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