- ✓In same phase
- BIn opposite phase
- CUp and down
- DLeft and right
Wave front by definition is the locus of points having same phase.
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$(a)$ The electric lines of force entering into a Gaussian surface provide negative flux.
$(b)$ A charge ' $q$ ' is placed at the centre of a cube. The flux through all the faces will be the same.
$(c)$ In a uniform electric field net flux through a closed Gaussian surface containing no net charge, is zero.
$(d)$ When electric field is parallel to a Gaussian surface, it provides a finite non-zero flux.
Choose the most appropriate answer from the options given below


Statement $1$ : Very large size telescopes are reflecting telescopes instead of refracting telescopes.
Statement $2$ : It is easier to provide mechanical support to large size mirrors than large size lenses.