The mod «Gun Scope (Scope)» introduces a zooming/aiming feature for bows in Minecraft PE. This enhancement allows you to shoot with much greater accuracy. Whenever you crouch while holding a bow, the aiming mode activates automatically, enabling you to hit your targets with remarkable ease and precision.
How does it work?
You can engage the aiming mode in MCPE by sneaking and holding the bow. This will make hitting your targets significantly easier, as they will appear closer than they actually are.
This screenshot is taken from a third-person perspective. As shown, there are at least 15 blocks between the player and the creeper. However, as long as the scope mode is active due to your sneaking, the player perceives their target as being much closer.