roughworks

UCEED 2019

0/85
UCEED2019Q35·msq·Hard

A set of two frames with square openings when perfectly overlapped with each other allow light through it in certain patterns. Shown below are four sets of such frames. These frames are either hinged (A and B) or pivoted (C and D) to each other. Assuming that the red frames are fixed and the blue frames are allowed to move, which option(s) will allow light to pass through as in the pattern shown on the left?

A set of two frames with square openings when perfectly overlapped with each other allow light through it in certain patterns. Shown below are four sets of such frames. These frames are either hinged (A and B) or pivoted (C and D) to each other. Assuming that the red frames are fixed and the blue frames are allowed to move, which option(s) will allow light to pass through as in the pattern shown on the left?