Three prisms 1, 2 and 3 have the prism angle A = 60°, but their refractive indices are respectively 1.4, 1.5 and 1.6.  If ${\mathrm{\delta }}_1,{\mathrm{\delta }}_2,{\mathrm{\delta }}_3$ be their respective angles of deviation then

• A

  ${\mathrm{\delta }}_3>{\mathrm{\delta }}_2>{\mathrm{\delta }}_1$

• B

  ${\mathrm{\delta }}_1>{\mathrm{\delta }}_2>{\mathrm{\delta }}_3$

• C

  ${\mathrm{\delta }}_1={\mathrm{\delta }}_2={\mathrm{\delta }}_3$

• D

  ${\mathrm{\delta }}_2>{\mathrm{\delta }}_1>{\mathrm{\delta }}_3$