1.

An object is placed at a distance of 60 cm from a concave lens offocal length 30 cm.(i) Use lens formula to find the distance of the image from the lens.(i) List four characteristics of the image (nature, position, size.erect/inverted) formed by the lens in this case.(iii) Draw ray diagram to justify your answer of part (ii).

Answer»

U=-60cm f= -30cm 1/f=1/v-1/u1/v=1/f+1/uon substituting v=-10cmm=v/um=-10/-30m=1/3=.33so the magnification is positive so it is a virtual erect image .m isless than 1 so the image is diminished .and v is negative so the image is formed on the same side of the lens.

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